Quarterly report pursuant to Section 13 or 15(d)

Fair Value of Other Securities (Details Textual)

v2.4.1.9
Fair Value of Other Securities (Details Textual) (USD $)
3 Months Ended
Mar. 31, 2015
Nov. 30, 2012
Mar. 31, 2014
Schedule of Equity Method Investments [Line Items]      
Transfers between levels $ 0corr_FairValueTransfersBetweenLevelsTransfersAmount $ 0corr_FairValueTransfersBetweenLevelsTransfersAmount  
Escrow Receivable Release Percentage after Time Expiration 50.00%corr_EscrowReceivableReleasePercentageafterTimeExpiration    
Lightfoot Capital Partners LP [Member]      
Schedule of Equity Method Investments [Line Items]      
Equity interest 6.70%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= corr_LightfootCapitalPartnersLpMember
  6.70%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= corr_LightfootCapitalPartnersLpMember
Vantacore Partners LP [Member]      
Schedule of Equity Method Investments [Line Items]      
Equity interest     11.10%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= corr_VantacorePartnersLpMember
Minimum [Member] | Lightfoot Capital Partners LP [Member]      
Schedule of Equity Method Investments [Line Items]      
Fair Value Inputs, Discount for Lack of Marketability 16.60%us-gaap_FairValueInputsDiscountForLackOfMarketability
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= corr_LightfootCapitalPartnersLpMember
   
Fair Value Inputs, Discount Rate 12.00%us-gaap_FairValueInputsDiscountRate
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= corr_LightfootCapitalPartnersLpMember
   
Maximum [Member] | Lightfoot Capital Partners LP [Member]      
Schedule of Equity Method Investments [Line Items]      
Fair Value Inputs, Discount for Lack of Marketability 21.30%us-gaap_FairValueInputsDiscountForLackOfMarketability
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= corr_LightfootCapitalPartnersLpMember
   
Fair Value Inputs, Discount Rate 14.00%us-gaap_FairValueInputsDiscountRate
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= corr_LightfootCapitalPartnersLpMember